🚀 go-pugleaf

Instead of 64 bit addressing, the ESA/370 architecture uses the
advanced address-space facility to provide multiple address spaces
2G-byte in size.  In effect, many 2G-byte spaces (31 bit addressing)
versus one single giant address space (32+ bit addressing).  I don't
think IBM was worried about C programs when they designed ESA/370;
IBM needed to provide a way for a program to have access to a larger
concurrent address space than 370-XA allowed but with a level of
compatibility with 370-XA.

In this case, it's programs defining the architecture,
not the architecture defining the programs.